Relleno de Concreto sin Finos

No-Fines Concrete Installation Steps

Refer to reinforced retaining wall installation for the complete installation steps when preparing the base trench and installing the first course of blocks. Once the first course of blocks are installed and leveled, follow these simple steps to place the No-Fines Concrete Backfill:

• The vertical height of a no-fines concrete pour should not exceed 16 in (406 mm) or two courses of block. Therefore, no-fines walls should be built in no more than two-course lifts.
• It is recommended for straight wall sections that at least one of the back wings of the Allan Block units be removed to help secure the block face to the concrete backfill.
• Fill all voids in the block with no-fines concrete. Rodding the material into the cores will ensure that all voids in the two-course lift are filled completely.
• Backfill to the specified depth with the no-fines concrete up to level with the top of the two-course lift. Obviously, there are numerous ways to get the concrete mix to the back of the wall. Each site will be different.
• It is not required to let the no-fines concrete cure between pours because it will start to cure soon after being placed. You can continue to pour the no-fines concrete mix until the two course lift is complete. Additional courses of block can be stacked following the completion of the lower two-course lift.
• It is recommended that a cure time of 2-3 hours is utilized after a maximum of 4 ft (1.2 m) in wall height in installed.

Additional Courses

• Before allowing the no-fines concrete to cure, excess material must be brushed off the top of the block to aid in the installation of the following courses of block. Install the next course of blocks ensuring that they are level. Place the no-fines concrete backfill the same way as outlined in the previous step.
• Continue these steps until the wall reaches its designed height.
• If any no-fines concrete spills onto the face of the block, it is important to remove it before it cures. Using a brush and clean water helps to remove the cement past.

Finishing Options

• Use 8-12 in (200-300 mm) of low permeable fill on the last lift to finish off wall.
• Place a horizontal layer of filter fabric above the no-fines mass prior to placing low permeable fill above.
• Learn more information on ending and topping off the wall.

No-Fines Concrete

Pour No-Fines Concrete into block cores and behind block

Brush off top of blocks before installing next course of blocks